Make sure to add a new line at the end of XML files

csharp/Google.Protobuf.Tools.nuspec

diff --git a/csharp/Google.Protobuf.Tools.nuspec b/csharp/Google.Protobuf.Tools.nuspec
index 2ed8c88..411ee28 100644
--- a/csharp/Google.Protobuf.Tools.nuspec
+++ b/csharp/Google.Protobuf.Tools.nuspec
@@ -36,4 +36,4 @@
     <file src="Google.Protobuf.Tools.targets" target="buildCrossTargeting"/>
     <file src="Google.Protobuf.Tools.targets" target="build"/>
   </files>
-</package>
\ No newline at end of file
+</package>

csharp/src/Google.Protobuf/Google.Protobuf.csproj

diff --git a/csharp/src/Google.Protobuf/Google.Protobuf.csproj b/csharp/src/Google.Protobuf/Google.Protobuf.csproj
index b965f4c..8306c74 100644
--- a/csharp/src/Google.Protobuf/Google.Protobuf.csproj
+++ b/csharp/src/Google.Protobuf/Google.Protobuf.csproj
@@ -33,4 +33,4 @@
     <PackageReference Include="SourceLink.Create.CommandLine" PrivateAssets="All" Version="2.7.6"/> 
   </ItemGroup>
 
-</Project>
\ No newline at end of file
+</Project>